engUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014214316210.22052/ijmc.2013.52895289A Diffusion Equation with Exponential Nonlinearity Recant DevelopmentsA. HUBER1AustriaThe purpose of this paper is to analyze in detail a special nonlinear partial differential equation (nPDE) of the second order which is important in physical, chemical and technical applications. The present nPDE describes nonlinear diffusion and is of interest in several parts of physics, chemistry and engineering problems alike. Since nature is not linear intrinsically the nonlinear case is therefore the general. We determine the classical Lie point symmetries including algebraic properties whereas similarity solutions are given as well as nonlinear transformations could derived. In addition, we discuss the nonclassical case which seems to be not solvable. Moreover we show how one can deduce approximate symmetries modeling the nonlinear part and we deduce new generalized symmetries of lower symmetry. The analysis allows one to deduce wider classes of solutions either of practical and theoretical usage in different domains of science and engineering.http://ijmc.kashanu.ac.ir/article_5289_2e007f25037d0d105f2b293110474ea8.pdfNonlinear partial differential equation(s) or (nPDE(s))Evolution equationsLie group analysisSimilarity reduction (SR)Approximate symmetriesGeneralized symmetriesnonlinear diffusionengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014216317510.22052/ijmc.2013.52905290Feature Selection and Classification of Microarray Gene Expression Data of Ovarian Carcinoma Patients using Weighted Voting Support Vector MachineS. MASOUM1S. GHAHERI2University of Kashan, I. R. IranUniversity of Kashan, I. R. IranWe can reach by DNA microarray gene expression to such wealth of information with thousands of variables (genes). Analysis of this information can show genetic reasons of disease and tumor differences. In this study we try to reduce high-dimensional data by statistical method to select valuable genes with high impact as biomarkers and then classify ovarian tumor based on gene expression data of two patient groups. One group treated by standard therapies and survived, while another group didn’t be cure and die after some times. In the first step we used weighted voting algorithm (WVA) for selecting impressive genes to reduce dimension, therefore eliminate noisy data and make analysis easier and then partial least square – discriminante analysis (PLS-DA) and support vector machine (SVM) methods have been applied for classification of diminished data. Results show that classification by PLS-DA can distinguish two groups somewhat but SVM is more efficient and sufficient classification method.http://ijmc.kashanu.ac.ir/article_5290_429167f84c969ebf129c9a59185620b1.pdfWeighted voting algorithmSupport Vector MachineTumor classificationOvarian cancerGene Expression dataengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014217718310.22052/ijmc.2013.52915291The Generalized Wiener Polarity Index of some Graph OperationsY. WU1F. WEI2Z. JIA3South China Agricultural University, P. R. ChinaSouth China Agricultural University, P. R. ChinaSouth China Agricultural University, P. R. ChinaLet G be a simple connected graph. The generalized polarity Wiener index of G is defined as the number of unordered pairs of vertices of G whose distance is k. Some formulas are obtained for computing the generalized polarity Wiener index of the Cartesian product and the tensor product of graphs in this article.http://ijmc.kashanu.ac.ir/article_5291_e1096cccf72ca05e59729a62d14028f7.pdfWiener indexCartesian producttensor productengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014218519910.22052/ijmc.2013.52925292DFT Study of Kinetic and Thermodynamic Parameters of Tautomerism in 4−acyl PyrazoloneH. TAVAKOL1H. MOHAMMADI2S. ASLANZADEH3Isfahan University of Technology, IranTechnical Vocational University, IranTechnical Vocational University, IranIn the present work, DFT calculations are employed to obtain the optimized structures of 4- acyl pyrazolone tautomers (19 tautomers) using B3LYP/6-311++G** calculations. In addition, molecular parameters, IR frequencies and relative energies are extracted for all tautomers. The existence of aromatic ring, keto tautomer (versus enol tautomer), N-H bond (versus C-H bond) and C=N double bond (versus N=N double bond) are stabilizing factors in relative stabilities of tautomers. Calculation of vibrational frequencies showed that, in accordance with reported values, intramolecular hydrogen bond (existed in some tautomers) decreased the value of OH frequency. The solvent effects on relative stabilities of tautomers are calculated. The relative stabilities of all the tautomers in acetone, tetrahydrofurane and chloroform (in all solvents, except water) were relatively the same as those in the gas phase. In addition, a nearly good relationship is found between dipole moments of tautomers and their 7Gsolv in chloroform. This relation shows that by increasing the dipole moment, the absolute amount of 7Gsolv in chloroform increases.http://ijmc.kashanu.ac.ir/article_5292_c138510f74a2bbdb455cb2f330275055.pdfPyrazoloneDFTTautomerSolvent effectengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014220121210.22052/ijmc.2013.52935293Implicit One-step L-stable Generalized Hybrid Methods for the Numerical Solution of First Order Initial Value problemsA. SHOKRI1A. A. SHOKRI2University of Maragheh, IranAhar Branch, Islamic Azad University, IranIn this paper, we introduce the new class of implicit L-stable generalized hybrid methods for the numerical solution of first order initial value problems. We generalize the hybrid methods with utilize ynv directly in the right hand side of classical hybrid methods. The numerical experimentation showed that our method is considerably more efficient compared to well known methods used for the numerical solution of stiff first order initial value problems.http://ijmc.kashanu.ac.ir/article_5293_8028166ae8e7d9a63e3a80b18208adb4.pdfHybrid methodInitial value problemMultistep methodsOff-step pointsengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014221322010.22052/ijmc.2013.52945294The Hyper-Zagreb Index of Graph OperationsG. SHIRDEL1H. REZAPOUR2A. SAYADI3University of Qom, IranUniversity of Qom, IranUniversity of Tehran, IranLet G be a simple connected graph. The first and second Zagreb indices have been introduced as  vV(G) (v)2 M1(G) degG and M2(G)  uvE(G)degG(u)degG(v) , respectively, where degG v(degG u) is the degree of vertex v (u) . In this paper, we define a new distance-based named HyperZagreb as e uv E(G) . (v))2 HM(G)     (degG(u)  degG In this paper, the HyperZagreb index of the Cartesian product, composition, join and disjunction of graphs are computed.http://ijmc.kashanu.ac.ir/article_5294_fbb55de9f98dd512946bb421b81a8dfe.pdfHyper-Zagreb indexZagreb indexGraph operationengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014222123010.22052/ijmc.2013.52955295Applications of some Graph Operations in Computing some Invariants of Chemical GraphsM. TAVAKOLI1F. RAHBARNIA2Ferdowsi University of Mashhad, IranFerdowsi University of Mashhad, IranIn this paper, we first collect the earlier results about some graph operations and then we present applications of these results in working with chemical graphs.http://ijmc.kashanu.ac.ir/article_5295_d0a3f8a01ff5a70b280c0ea4a94f90f3.pdfTopological indexGraph operationDistance-balanced graphChemical graphengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014223123810.22052/ijmc.2013.52965296On the Roots of Hosoya Polynomial of a GraphM. REYHANI1S. ALIKHANI2M. IRANMANESH3Islamic Azad University, IranYazd University, Yazd, IranYazd University, IranLet G = (V, E) be a simple graph. Hosoya polynomial of G is d(u,v) H(G, x) = {u,v}V(G)x , where, d(u ,v) denotes the distance between vertices u and v. As is the case with other graph polynomials, such as chromatic, independence and domination polynomial, it is natural to study the roots of Hosoya polynomial of a graph. In this paper we study the roots of Hosoya polynomials of some specific graphs.http://ijmc.kashanu.ac.ir/article_5296_410164e0c444ea9cc736e03dd626520e.pdfHosoya polynomialrootPathCycleengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014223924810.22052/ijmc.2013.52995299Wiener Index of Graphs in Terms of EccentricitiesH. RAMANE1A. GANAGI2H. WALIKAR3Karnatak University, IndiaGogte Institute of Technology, IndiaKarnatak University, IndiaThe Wiener index W(G) of a connected graph G is defined as the sum of the distances between all unordered pairs of vertices of G. The eccentricity of a vertex v in G is the distance to a vertex farthest from v. In this paper we obtain the Wiener index of a graph in terms of eccentricities. Further we extend these results to the self-centered graphs.http://ijmc.kashanu.ac.ir/article_5299_e4714d9416dc74cc8611ae33bf9e475e.pdfWiener indexDistanceEccentricityradiusdiameterself-centered graphengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014224925510.22052/ijmc.2013.53005300Reciprocal Degree Distance of Grassmann GraphsL. POURFARAJ1Islamic Azad University, Central Tehran Branch, IranRecently, Hua et al. defined a new topological index based on degrees and inverse of distances between all pairs of vertices. They named this new graph invariant as reciprocal degree distance as 1 { , } ( ) ( ( ) ( ))[ ( , )] RDD(G) = u v V G d u  d v d u v , where the d(u,v) denotes the distance between vertices u and v. In this paper, we compute this topological index for Grassmann graphs.http://ijmc.kashanu.ac.ir/article_5300_292363a7d23f1a685a6e9673fa5fc53f.pdfGrassmann graphHarary indexVertex- transitive graphsengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014225726310.22052/ijmc.2013.53015301On the Higher Randić IndexY. ALIZADEH1Hakim Sabzevari University, Sabzevar, IranLet G be a simple graph with vertex set V(G) {v1,v2 ,...vn} . For every vertex i v , ( ) i  v represents the degree of vertex i v . The h-th order of Randić index, h R is defined as the sum of terms 1 2 1 1 ( ), ( )... ( ) i i ih  v  v  v  over all paths of length h contained (as sub graphs) in G . In this paper , some bounds for higher Randić index and a method for computing the higher Randic index of a simple graph is presented . Also, the higher Randić index of coronene/circumcoronene is computed.http://ijmc.kashanu.ac.ir/article_5301_2937bfe5de90a364cc45426a78b04b0b.pdfRandić indexHigher Randić indexCoronene /circumcoroneneengUniversity of KashanIranian Journal of Mathematical Chemistry2228-64892008-90152013-05-014226527010.22052/ijmc.2013.53025302On Second Atom-Bond Connectivity IndexM. ROSTAMI1M. SOHRABI-HAGHIGHAT2M. GHORBANI3Mahallat Branch, Islamic Azad University, IranArak University, IranShahid Rajaee Teacher Training University, I. R. IranThe atom-bond connectivity index of graph is a topological index proposed by Estrada et al. as ABC (G)  uvE (G ) (du dv  2) / dudv , where the summation goes over all edges of G, du and dv are the degrees of the terminal vertices u and v of edge uv. In the present paper, some upper bounds for the second type of atom-bond connectivity index are computed.http://ijmc.kashanu.ac.ir/article_5302_88b5b777af28eda3d055d50368c08a18.pdfAtom–bond connectivity indexTopological indexStar–like graph